Display device and test method of display device

Abstract

A display device and a test method of the display device are discussed. The display device can include a substrate having a display region and a non-display region, a circuit layer disposed in the display region and the non-display region, a plurality of banks disposed on the circuit layer, and a plurality of pixels each including a plurality of light-emitting elements disposed on the plurality of banks in the display region. The first electrodes of the plurality of pixels are connected to the anode electrodes of the plurality of light-emitting elements, and the second electrodes of the plurality of pixels are connected to the cathode electrodes of the plurality of light-emitting elements. Adjacent second electrodes of the pixels are disposed to face each other and are spaced apart from each other.

What is claimed is: 
     
         1 . A display device comprising:
 a substrate having a display region and a non-display region outside the display region;   a circuit layer disposed in the display region and the non-display region;   a plurality of banks disposed on the circuit layer;   a plurality of pixels each including a plurality of light-emitting elements disposed on the plurality of banks in the display region, wherein first electrodes of the plurality of pixels are connected to anode electrodes of the plurality of light-emitting elements, and second electrodes of the plurality of pixels are connected to cathode electrodes of the plurality of light-emitting elements, and adjacent second electrodes are disposed to face each other and are spaced apart from each other; and   a plurality of dummy pixels each including a plurality of dummy light-emitting elements disposed on the plurality of banks in the non-display region,   wherein a plurality of first dummy electrode lines of the plurality of dummy pixels in the non-display region are connected to anode electrodes of the plurality of dummy light-emitting elements and are not connected to each other, and   wherein a plurality of second dummy electrodes of the plurality of dummy pixels in the non-display region are connected to cathode electrodes of the plurality of dummy light-emitting elements, and adjacent second dummy electrodes among the plurality of second dummy electrodes are disposed to face each other and are spaced apart from each other.   
     
     
         2 . The display device of  claim 1 , wherein the plurality of dummy light-emitting elements are respectively disposed on the plurality of first dummy electrode lines facing each other. 
     
     
         3 . The display device of  claim 1 , wherein the plurality of dummy light-emitting elements are not configured to emit light or light up. 
     
     
         4 . The display device of  claim 1 , wherein the plurality of first dummy electrode lines are not connected to the first electrodes of the plurality of pixels. 
     
     
         5 . The display device of  claim 1 , wherein the plurality of second dummy electrodes are not connected to the second electrodes of the plurality of pixels. 
     
     
         6 . The display device of  claim 5 , further comprising an optical layer disposed on side surfaces of the plurality of light-emitting elements and the plurality of dummy light-emitting elements and on the plurality of banks. 
     
     
         7 . The display device of  claim 6 , wherein the optical layer includes:
 a first optical layer that covers the side surfaces of the plurality of dummy light-emitting elements and the plurality of banks, and   a second optical layer which covers a side surface of the first optical layer.   
     
     
         8 . The display device of  claim 7 , wherein a concave portion is formed at an upper end of a boundary region of the first optical layer and the second optical layer. 
     
     
         9 . The display device of  claim 7 , wherein the optical layer further includes:
 a third optical layer disposed on the second electrodes on the plurality of light-emitting elements and the second dummy electrodes on the plurality of dummy light-emitting elements.   
     
     
         10 . The display device of  claim 9 , further comprising:
 a black matrix disposed on the second electrodes, the second dummy electrodes, and the third optical layer, and including a plurality of through holes; and   a cover layer disposed on the black matrix.   
     
     
         11 . The display device of  claim 1 , wherein the circuit layer further includes:
 a pixel driving circuit disposed on the substrate and electrically connected to the plurality of light-emitting elements and a plurality of contact electrodes; and   a plurality of signal lines that electrically connect the first electrodes of the plurality of pixels to the pixel driving circuit.   
     
     
         12 . The display device of  claim 2 , wherein the plurality of second dummy electrodes are disposed to be separated from each other at a certain interval in a same row or in different rows on the plurality of dummy light-emitting elements. 
     
     
         13 . The display device of  claim 1 , wherein ends of the plurality of first dummy electrode lines are configured to receive a voltage while being connected to a pad electrode disposed in a pad region of the non-display region. 
     
     
         14 . The display device of  claim 7 , wherein the first optical layer is disposed between the plurality of second dummy electrodes disposed spaced apart from each other in a same row. 
     
     
         15 . A test method for the display device of  claim 1 , comprising determining whether a short circuit occurs between the plurality of dummy pixels based on a resistance measurement value of the adjacent second dummy electrodes of the plurality of dummy pixels. 
     
     
         16 . The test method for the display device of  claim 15 , further comprising cutting out an end portion of at least one of the plurality of first dummy electrode lines based on a result of the determining.